Heating unit



Jan. 8, 1929.

Figa

'I FreoIerzcIe 1 b'ben v Inventor BBM Attorneys Patented Jan. 8, v1929.

UNITED STATES FREDERICK M.. HIBBEN, OF` LAKEWOOD, OHIO.

' HEATING UNIT.

-Application filed June 23, 1927. Serial No. 200,870.

This invention relates to heating units, and particularly toelectrically Aheated portable cooking utensils and air heaters designedfor attachment to ordinary household electrical outlets, and theprincipal object of my invention is to provide a new and'improvedheating yunit readily convertible to serve satisfactorily 'and'veiiiciently a plurality ofv uses. In the drawings accompanying thisspecification l0 and forming a part of this application I have shown,for purposes of illustration, and in part diagrammatically, one formwhich my invention may assume, and in these drawings: z l Figure 1 is aplan view of the embodiment of my invention herein shown, while Figure 2is a section on the line 2-2 of Figure 1.

1t is well known to those ski11ed in the art that no device demanding1in excess of 660 watts will be approved by't e National Board of FireUnderwriters for use in the ordinary household electrical outlet, andaccordingly that no device to be connected to the ordinary at householdelectrical outlet can enjoy any appreciable sale inthe United Statesunless its power-consumption does not exceed this maximum of 660 watts.-It is also well known to those skilled in the art that '66() wattsprovides substantially the proper heating .for -a wae bakerof the usualseven inch diameter, and that this size has become accepted as thestandard -in .electrically heated domestic waie bakers, and that waiilebakers oft this size are in wide use throughout the United States. Anumber of devices have been proposed for adapting `a wallie baker-forother purposes, by conversion, but so far as .l ain aware in all thesedevices heretofore proposed the alternative use has been by a conversionofathe wae baker em loyin only half of the heat capacity oft e wa ebaker, and .therefore furnishing heat too low for substantially all ofthe other uses proposed, certainly too low for cooking, or for broiling.The particular embodiment of my invention herein shown overcomes this'defect and viturnishes a singleelectrical heating unit satisactoryzboth.as a wailie baker, as a cooking 5o stove, and as a broiler. n

The heating unitll herein shown c oinp en upper section 12 provided withan operating handle 13 and pivotally connected by'means'o ahinge' 14' toasimilar lower section 15 sup rtd in any suitable manner, as

by'a plur ity of legs 16. Each of the sections 12-and 15 comprises aheat insulated annular frame member 17 closed at its end abutting theother section`15 .or 12 by means of a Cast metallic face plate 18orxning'with the 60 -face plate 18 of the other section 15 or 12 acavity 19 suitable for baking wailes, and closed at its other' end by awall portion variable between heat insulating condition con? fining andrellectitng the heat to the corresponding face plate 18 and heattransmitting. condition penmitting lthe passage of heat through'thatwall portion, ,the variation of that wall portion being accomplished inany desired manner, herein by forming that wall portion as a heatinsulated closure plate 2() removably secured to the frame member 17 vby means of suitable bayonet joints 21 normally holding the closureplate 20 in position closin the section 12 or 15 and confining 75 andreflecting the heatto thel corresponding face plate 18, but'permittingremoval of the Vclosure plate 20 to permit emergence of the heat throughthe then open end of that frame member 17. an Mounted on the framemember 17 of the lower section 15 are four terminals 22 and `23 and 24and 25'positioned in vertical alignment equally s aced so that any twoadjacentterminals may e engaged by the Vtwo recesses 85 of a two Contactattachment plug 26' having its two contacts connected to powerconductors 27 and 28, mounted in the upper section 12 is a irst'heatingelement 29 having one end connected by means ot a conductor 30 to the 9oupper terminal 22,' mounted in the up er section'12below the heatingelement 29 a ja.- cent that face plate 18-isa second heating element 31having one end'connected by means of a conductor 32 to the secondterminal 23, 95

mounted in the lowersection fk5-adjacent the faceplate 18 ofthe 'lowersection 15 is a third.

heating element 33A having one and connected` by means of a conductor 34to the thirdterminal 24, mounted inthe lower section 15 -be- .150'

low the third element 33 is a fourth heating element 35 having one endconnected by means of a conductor 36 to thetourth terminal 25, whileconnectin the free ends of the 4heating elements 29 an 31and 33. and 35105 is an intermediate Gommon conductor 37, It will of course beunderstood those skilled in the art that between the two sections 12 and15 the-variousl conductors are carried in a suitable flexible cable 38.*

lFrom the above'fdescri tion it will .be ob'- vious to those-skilled-.int eert that'with the4 lie' ' minas 22 und plug 426 applic tothe firstand second ter- 'the first and second heating elements 29 and 31 will beenergized, the full permitted heating capacity will be present in thetopsection, and the unit by removal of' the top closure plate will.function as a. cooking stove of full-permitted heating ca` pacity; thatwith the plug 26 applied tothe second and third termina-ls- 23 and 24the second and third heating elements 31 and 33 'will be energized, theentire permitted heating capacity will be divided between the upper andlower sections 12 and 15 applied equally to the two face plates 18 sothat the unit, with the closure plates 20 'in position, will function asa-wafli'e 'baker of full permitted heatingcapacityyand that with lthe i-plug 26 applied to' thet-h-ird' and fourth ter- I minals -24 'and 25the ythird and `fourth heating'elements 33 and 35 will be energized, the

entire permitted heating capacity will be esent in the lower-section15,-and the unit y removalof the bottomvclosure plate 20 will functionas a broilerof full permitted heating ca 4acity.

Under t ese circumstancesit will necessarily be obvious to those skilledin the art thatfI have providedfa--new and improved itzalso will beunderstood by those skilledl 351' particular embodiment of'`sacrificing. the advantagesv thereof, and 'itconvertible heating u-nitparticularlysuitable for domestic usesenergizedfrom the usual4 domesticelectrical outlet, and therefore that If have accomplished at least theIprincipal object of my invention. At the Sametime in the art that the myinvention herein sho-wn and described possesses advantagesotherthan'those pointed out or suggested herein, and-also thatthisparticular embodiment of my invention may e variously changed andmodified-without departing Afrom the spirit of my' invention orA,therei'orewill -be understood that the disclosure herein: isillustrative only, and that myinvention is not limited thereto. 'I Iclaim 1. "In combination with an electric-,heating unit comprisingafirst section anda second section adapted to be laced in abuttingrelation, havlng their aV utting.-faces formed ofheat.conductingmaterial and-spaced to -fornr a' cavitytherebetween, asfor lbaking wa'files, and having .a wall portion of one of -saidsections adapted to permit the! emerv gence of heat therethrough-,as forcooking,

or broiling; comprising-also a rst heating element carriedby `the otherof said sections 'in position to heat-said abutting face of s'aidl othersection; 'asecond heating element carried' by saldone sectioniii-position tofheat s aidabutting face of' said one section or throughsaid wall portion, and-a third heating element carriedffbyi-'said-onesection in i l position-to heat throu h` said walllportion;

connectionsfor energizing only said first and second elements to heatsaid cavity, or only said second and thirdel'etnents toheat doublythrough said wall portion. v

2, In combinationqwith an Velectric heating iiniteonpris'inafirstsection and a second section adapted5 to be placed in abutting reslation, having their abutting faces formed of heat conducting materialand spaced to form a cavity therebetween, as for baking waf` fles, andhaving a--swall portion` of; one of said sections removable to permitthe vemerf said cavlty, orssaid second` and third elements to headdoubly1 through saidzremovable vwall portion. v v

3. In combination with an electric heating unit com risin afirst sectionaand a second section adapte to' be placed yin abutting re lation,having their abuttingifaces formed of heat conduetlngmaterial `andspaced to form la cavity therebetween, as' for baking waiiies,

and having ineach of said sections a wall portion adapted '-to permitthe emergenceoffi heat therethroughf-as for cooking, or broilingcomprisin .also lafirst heating element carried by said rst section inposition to-heat through said wall portion of said iirstsection,

a second heating element carried by said first4l section in position toheat said abuttingface of said Efirst section orthrouv-h said -walportion of saidiirst section?, athird heating element carried `by-saidsecond section in' pesi-y tion "to heat 'said abutting face of saidsecond section or through said wall portion of-said second section, anda vfourthheating 'element carriedby said second-section in position toheatthro-ugh said wal-l portion of-said second portion, and a' l bysaid-onev section;` connections for energizin isaid-firstv and secondelements to heatl doub `y'through said wall ortion of sa-id -firstsection, orsald second and third'elem'ents to heat said cavity, or saidthird and .l fourth elementsto heat doubly through said wall portion 'ofsaid sec# ond section'.

f4; In combination :with `an `electric heating unit -com rising.- afvfirst section ,and a-fsecond section a apted to be placed in abuttingrelation, having their'abutting--faces formed ofl heatconductihgmaterial and spacedto form a cavit therebetween, as forbak-ingawaffles, an havinga wall portion of `one of said sectionsadapted to permitthe `emergence of heat therethrough, as for cooking, or,broiling.; 'comprising also arst heating-element carried by the otherof said sections in position to heat said abutting face of said. othersection, a second heating element carried by said one section inposition to heat said abutof said first element and the open end of saidsecond element to energize said first and second elements to heatsaidfcavity, or tothe open end of said second element and the open endof said Ythird element toenergi'ze said second and third elements toheat doubly through said wall portion.

5.' In combination with an electric heating unitconiprising a firstsection and a second section adapted to be placed in abutting re lation,having their abutting faces formed of heat conducting material andspaced to form a cavity therebetween, as for baking waffles, and havingin each of said sections a wall portion adapted to permit the emergenceof heat therethrough, as for cooking, or broiling; comprisin also afirst heating element carried by said rst section in position to heatthrough said wall portion of said first sec? tion, a second heatinelement carried by said first section in position to heat said abuttingface of said first -section or through said wall portion of said firstsection, a third heating element carried by said second section inposit-ion to heat said abutting face of said second section or throughsaid wall portion of said second section, andl a fourth heating elementcarried by said second section in position to heat through said wallportion of said second section; connections connecting said elements instar; and connections for connecting power leads to the open end of saidfirst element and the open end ofsaid second element to energize saidfirst and second elements to heat doubly through said wall portion ofsaid first section, or to the open end of said second element and theopen end of said third element to energize said second and thirdelements to heat said cavity, or to the open end of said third elementand the open end of said fourth ele-ment to energize said third andfourth elements to heat doubly through said wall portion of said secondsection.

`6. In combination with an electric heating unit comprising a firstsection and a second section adapted to be placed in abutting relation,having their abutting faces formed of heat conducting material andspaced to form a cavity therebetween, as for baking wafiies, and havinga wall portion of one of said sections removable to permit theeinergence of heat therethrough, as for cooking,

or broiling; comprising also a first heating element carried by theother of said sections in position to heat said abutting face of saidother section, a second heating element carl ried by said one section inposition to heat said labutting face Iof said one section or throughsaid removable wall portion, and a third heating element carried by saidone section in position to heat through said removable wall portion;connections for energizing only said first and second elements to heatsaid cavity, or only7 said second and third elements toheat doublythrough said removable 'wall portion.

7 In combination with an electric heating unitcomprising a first sectionand a second section adapted to be placed in abutting relation, havingtheir abutting faces formed of heat conducting material and spaced toform a cavit therebetween, as for baking waf` fles, an having in eachofsaid sections a wall portion adapted to permit the emergence of heattherethrough, as for cooking, or broiling; comprising also a firstheating element carried by said first section in position to heatthrough said wall portion of said first section, a second heatingelement carried by said first section in position to heat said abuttingface of said first section or through said wall portion of said firstsection, a .third heatl ing element carried by said second section inposition to heat said abutting face of said second section or throughsaid wall portion of said second section, and a fourth heating-elementcarried by said second section in position to heat through said wallportion of said second section; connections for energizing only saidfirst and second elements to heat doubly through said wall portion ofsaid first section, or only said second and third elements to heat saidcavity, or only said third and fourth elements to heat doubly throughsaid wall portion of said second section.

In testimony whereof I hereunto afiix my4 signature. Y

FREDERICK M. HIBBEN.

